如何解决Flutter Navigation BuilderContext子类型错误？

如何解决如何解决Flutter Navigation BuilderContext子类型错误？

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:flutter_auths/pages/searchservice.dart';
import 'package:flutter_auths/pages/tasks.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      theme: new ThemeData(
        primarySwatch: Colors.blue,),home: new MyHomePage(),);
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  var queryResultSet = [];
  var tempSearchStore = [];

  initiateSearch(value) {
    if (value.length == 0) {
      setState(() {
        queryResultSet = [];
        tempSearchStore = [];
      });
    }

    var capitalizedValue =
        value.substring(0,1).toUpperCase() + value.substring(1);

    if (queryResultSet.length == 0 && value.length == 1) {
      SearchService().searchByName(value).then((QuerySnapshot docs) {
        for (int i = 0; i < docs.documents.length; ++i) {
          queryResultSet.add(docs.documents[i].data);
        }
      });
    } else {
      tempSearchStore = [];
      queryResultSet.forEach((element) {
        if (element['Username'].startsWith(capitalizedValue)) {
          setState(() {
            tempSearchStore.add(element);
          });
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: Text('Firestore search'),body: ListView(children: <Widget>[
          Padding(
            padding: const EdgeInsets.all(10.0),child: TextField(
              onChanged: (val) {
                initiateSearch(val);
              },decoration: InputDecoration(
                  prefixIcon: IconButton(
                    color: Colors.black,icon: Icon(Icons.arrow_back),iconSize: 20.0,onPressed: () {
                      Navigator.of(context).pop();
                    },contentPadding: EdgeInsets.only(left: 25.0),hintText: 'Search by name',border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(4.0))),SizedBox(height: 10.0),GridView.count(
              padding: EdgeInsets.only(left: 10.0,right: 10.0),crossAxisCount: 2,crossAxisSpacing: 4.0,mainAxisSpacing: 4.0,primary: false,shrinkWrap: true,children: tempSearchStore.map((element) {
                return buildResultCard(element);
              }).toList())
        ]));
  }
}

Widget buildResultCard(data) {
  return Card(
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),elevation: 2.0,child: Container(
          child: Column(
              children: <Widget> [ Text(data['Username'],textAlign: TextAlign.center,style: TextStyle(
                  color: Colors.black,fontSize: 20.0,RaisedButton(
                  onPressed: () {
                    Navigator.push(
                      data,MaterialPageRoute(builder: (data) => ProfilePage()),);
                  },child: const Text('asd',style: TextStyle(fontSize: 12)),]
          )
      )
  );
}

在这里我从数据库中搜索一个用户，然后向我显示卡片中的结果，我添加了一个按钮，然后单击它，我想将该页面导航到另一个页面，但是发生以下错误。 this is the error and the app

因此，我想单击特定用户的按钮，然后将页面重定向到该用户的个人资料。我该怎么办？

解决方法

您将收到此错误，因为您没有传递buildContext，而是传递了数据。 因此，如果您从此处更改代码，则错误将被消除

import re
string = '#2a$#b%c%561#' # input string
new_string = '#' * len(re.sub(r'\D','',string))

到

Navigator.push(
   data,MaterialPageRoute(builder: (data) => ProfilePage()),);

这是将数据传递到“个人资料页面”的方式。

也

Navigator.push(
   context,MaterialPageRoute(builder: (context) => ProfilePage(username: data['Username']))
);

更改为

Widget buildResultCard(data)

和

Widget buildResultCard(context,data)

到

buildResultCard(element);

,

首先，您需要使用类似的数据导航到该页面

Navigator.push(
   context,MaterialPageRoute(builder: (context) => ProfilePage(profileData: data))
);

然后您需要接收该数据

class ProfilePage extends StatefulWidget {
  var profileData;

  ProfilePage({this.profileData});

  @override
  _ProfilePageState createState() => _ProfilePageState();
}

class _ProfilePageState extends State<ProfilePage> {



  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text(widget.profileData['username']),),);
  }
}

您可以通过其他方式传递和接收数据

Navigator.push(
    context,MaterialPageRoute(builder: (context) => ProfilePage(),settings: RouteSettings(arguments: data))
);

然后

    class ProfilePage extends StatefulWidget {

  @override
  _ProfilePageState createState() => _ProfilePageState();
}

class _ProfilePageState extends State<ProfilePage> {
  var profileData;
  
  @override
  Widget build(BuildContext context) {
    profileData=ModalRoute.of(context).settings.arguments;
    return Scaffold(
      body: Center(
        child: Text(profileData['username']),);
  }
}